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Scope:

This International Standard provides standard composite test
methods for determining the suitability of a specimen when
subjected to environmental conditions consisting of a sequence of
temperature, humidity and, where required, low air pressure
environmental stresses.

The order of application of the stresses and conditions for the
change from one step to the next have been chosen to accelerate and
amplify degradation mechanisms of the same type as those observed
under natural climatic conditions.

This standard may be applied to other electrotechnical products
when the degradation mechanisms are the same and the specified
requirements for testing can be satisfied. In other cases, it may
form a basis for the writing of a similar test.

In this test, specimens are exposed to environmental tests in a
standard order and categorized according to the basic code defined
in Appendix A of IEC 68-1 except that the third group of digits is
used as an indication of the number of cycles in Step 5 of the damp
heat cyclic Test Db according to clause 6 in IEC 68-2-30. In the
climatic categories -/-/56, 40-/-, etc., in this standard the
dashes may be replaced by any of the standard values appropriate to
the space as in the following examples: 55/100/56, 25/085/56,
40/085/21. Where any modification is necessary, the relevant
specification shall provide the necessary information for each step
in the selected method.

This test is frequently specified to follow other tests
involving mechanical stress, for example tests for robustness of
terminations, solderability, shock and vibration, as a means of
determining whether the sealing of the specimen has been
damaged.